MVC 各种传值方式

MVC 各种传值方式 ViewData传值.
HomeController.cs Co

de:

public ActionResult Index()
{
     ViewData["Title" ] = "Home Page" ;
     ViewData["Message" ] = "Welcome to ASP.NET MVC!" ;
     return View();
}

Views/Home/Index.aspx Code:

<asp:Content ID="indexContent" ContentPlaceHolderID="MainContent" runat="server" >
    <p>
    <%= Html.Encode(ViewData["Message" ]) %>
    </p>
</asp:Content>

结果:在页面上显示Welcome to ASP.NET MVC!

示例二:
带参数传值.
URL Routing规则:

routes.MapRoute(
    "Default" ,                                              // Route name
    "{controller}/{action}/{param}" ,                           // URL with parameters
    new { controller = "Home" , action = "Index" , param = "" } // Parameter defaults
);

HomeController.cs Code:

public ActionResult Index(string param,int? paraInt,string paraStr)
{
    ViewData["Title" ] = "Home Page" ;
    ViewData["Message" ] = "Welcome to ASP.NET MVC!" ;
    ViewData["Param" ] = param;
    ViewData["ParaInt" ] = paraInt;
    ViewData["ParaStr" ] = paraStr;
    return View();
}

Views/Home/Index.aspx Code:

<asp:Content ID="indexContent" ContentPlaceHolderID="MainContent" runat="server" >
    <p>
    <%= Html.Encode(ViewData["Message" ]) %>
    </p>
    <p>
    <%= Html.Encode(ViewData["Param" ]) %>
    </p>
    <p>
    <%= Html.Encode(ViewData["ParaInt" ] ?? (object )"(null)" )%>
    </p>
    <p>
    <%= Html.Encode(ViewData["ParaStr" ] ?? (object )"(null)" )%>
    </p>
</asp:Content>

结果:
访问:/home/index/hello?paraint=520&parastr=world
显示: hello 520 world
访问:/home/index/hello
显示:hello (null) (null)

示例三:
强类型传值:

新建一个xml文件:

<?xml version="1.0" encoding="utf-8" ?>
<root>
<item name="Sea" >
    <animal>Fish</animal>
    <animal>Shrimp</animal>
    <animal>Crab</animal>
</item>
<item name="Sky" >
    <animal>Bird</animal>
    <animal>Man</animal>
</item>
</root>

新建一个类读取xml数据.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Xml.Linq;
using System.Web.Hosting;

namespace ViewData.Models
{
    public class Space
    {
        public string Name { get ; set ; }
        public string [] Animal { get ; set ; }
        private static Space space;
        public IEnumerable<Space> GetSpace()
        {
            XDocument xml = XDocument.Load(HostingEnvironment.MapPath("~/App_Data/Space.xml" ));
            IEnumerable<Space> results = from p in xml.Root.Elements("item" )
                                         select new Space
                                         {
                                             Name = p.Attribute("name" ).Value,
                                             Animal = p.Elements("animal" ).Select(r => r.Value).ToArray()
                                         } ;
            return results;
        }
        public static Space Instance
        {
            get
            {
                if (space == null )
                {
                    space = new Space();
                }
                return space;
            }
        }
    }
}

在HomeController内添加Action:

public ActionResult About()
{
    ViewData["Title" ] = "About Page" ;

    return View(Space.Instance.GetSpace());
}

在About.aspx.cs后天修改如下.

public partial class About : ViewPage<IEnumerable<Space>>

About.aspx调用数据:

<%foreach (var p in ViewData.Model){ %>
<ul>
<li><%=p.Name %>
<ul>
<%foreach (string r in p.Animal){ %>
<li><%=r%></li>
<%} %>
</ul>
</li>
</ul>
<%} %>

结果:

示例四:

表单的值回传给服务器.

新建一个UserM类:UserM.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace ViewData.Models
{
    public class UserM
    {
        public string Name { get ; set ; }
        public string Password { get ; set ; }
        private static UserM user;
        
        public static UserM Instance
        {
            get
            {
                if (user == null )
                {
                    user = new UserM();
                }
                return user;
            }
        }
    }
}

HomeControllers添加Action

[AcceptVerbs("GET")] //GET调用
public ActionResult Form()
{
    return View(UserM.Instance);
}

[ActionName("Form"), AcceptVerbs("POST")]//POST调用
public ActionResult SaveForm()
{
    UpdateModel(UserM.Instance, new [] { "Name" , "Password" } );
    return View(UserM.Instance);
}

Form.aspx.cs后台添加强类型引用

public partial class Form : ViewPage<UserM>

Form.aspx

<p>
<%=Html.Encode(ViewData.Model.Name) %><br />
<%=Html.Encode(ViewData.Model.Password) %>
</p>
    <%Html.BeginForm();%>
    Name:<%=Html.TextBox("Name" )%>
    Password:<%=Html.Password("Password" ) %>
    <input type="submit" value ="Submit" />
    <%Html.EndForm(); %>